Answer:
The average speed for the four laps is 9 km/h.
Step-by-step explanation:
The average speed of the four laps can be calculated as follows:
[tex] \overline{v_{T}} = \frac{\overline{v_{1}} + \overline{v_{2}} + \overline{v_{3}} + \overline{v_{4}}}{4} [/tex]
Where:
[tex]\overline{v_{1}}[/tex]: is the average speed for the first lap
[tex]\overline{v_{2}}[/tex]: is the average speed for the second lap
[tex]\overline{v_{3}}[/tex]: is the average speed for the third lap
[tex]\overline{v_{4}}[/tex]: is the average speed for the fourth lap
Hence, the average speed for the four laps is:
[tex] \overline{v_{T}} = \frac{12 km/h + 10 km/h + 8 km/h + 6 km/h}{4} [/tex]
[tex] \overline{v_{T}} = 9 km/h [/tex]
Therefore, the average speed for the four laps is 9 km/h.
I hope it helps you!
